package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.mysql.jdbc.Connection;
import lombok.SneakyThrows;
import model.UserInfo;
import util.AppVar;
import util.DBUtils;
import util.ResultUtils;
import util.SessionUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

/**
 * 修改文章信息
 */
@WebServlet("/upart")
public class UpdateArtServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String msg="未知错误";
        int data=0;
        UserInfo userInfo= SessionUtils.getLoginUser(req);
        if(userInfo!=null) {
            //1.得到前端的参数
            String title = req.getParameter("title");
            String context = req.getParameter("context");
            String aidStr = req.getParameter("aid");
            if(!StrUtil.isBlank(title) && !StrUtil.isBlank(context) && !StrUtil.isBlank(aidStr)){
                int aid=Integer.valueOf(aidStr);
                if(aid>0){
                    //2.在数据库中修改参数
                    Connection connection = DBUtils.getConnection();
                    String sql=" update article set title=?,context=? where aid=? and uid=?";
                    PreparedStatement statement = connection.prepareStatement(sql);
                    statement.setString(1,title);
                    statement.setString(2,context);
                    statement.setInt(3,aid);
                    statement.setInt(4,userInfo.getUid());
                    data=statement.executeUpdate();
                    //关闭资源
                    DBUtils.close(null,statement,connection);
                    msg="";
                }else{
                    msg="参数中文章id有误！";
                }

            }else{
                msg="参数不全！";
            }
        }else {
            msg="请先登录！";
        }

        //3.将修改后的结果返回给后端
        resp.setContentType(AppVar.RESPONSE_CONTENTTYPE_JSON);
        resp.getWriter().println((JSONUtil.toJsonStr(ResultUtils.toResult(200,data,msg))));
    }
}
